fix clone() for HashMap/HashSet
tests clone() for set/map
#234 Optimized DefaultTestExecutor.findCallbacks method
#234 Several performance improvements to DefaultTestExecutor
Merge pull request #236 from renatoathaydes/test-executor-optimizing

Test executor optimizing
minor
ceylon.net: Authority.equals: remove double user test
ceylon.net: Fix #220: missing hash